Copyright © 2022 Foshan MBRT Nanofiberlabs Technology Co., Ltd All rights reserved.Site Map
On May 21, 2024, Jia-Chen Shang published the latest research paper, "Flexible pressure sensor enhanced by polydimethylsiloxane and microstructured conductive networks with positive resistance-pressure response and wide working range," in Composites Part B: Engineering (Impact Factor: 13.1). Significant progress has been made in the large-scale production of flexible pressure sensors.
A simple and effective method has been proposed to combine a pre-strain strategy with polydimethylsiloxane (PDMS) infiltration to manufacture flexible pressure sensors with a wide working range, high sensitivity, and good stability. The effectiveness of the model has been verified through experiments. This study provides a reference for the simple and cost-effective manufacturing of advanced flexible sensors and offers valuable insights into the large-scale production of flexible sensors.
A simple and effective method is proposed to fabricate flexible pressure sensors via a pre-strain strategy and PDMS infiltration, which exhibit improved sensitivity (0.0331 kPa^-1), 8 ms response time, and stability and repeatability under 15% strain loading for 2500 cycles over a wide working range of 0.11-1250 kPa.
Preparation of conductive polyurethane (PU) sponge: Polyurethane (PU) sponges with different pre-strains were immersed in graphene oxide (GO) solution and subsequently reduced using hydroquinone (HQ). After removing the pre-strain, a conductive PU sponge with microstructures was obtained, which was covered with a reduced graphene oxide (rGO) conductive layer. Then, copper foil electrodes were adhered to the prepared conductive PU sponge using conductive silver glue to prepare for PDMS infiltration.
PDMS infiltration: The prepared conductive PU sponge was immersed in a PDMS precursor mixture (the weight ratio of matrix to curing agent was 10:1) and soaked under vacuum for 30 minutes to ensure complete infiltration. Then, the PDMS-infiltrated sponge was placed in a hot air oven and the PDMS was thermally cured at 80 °C for 3 h. Finally, the excess PDMS was removed to obtain the PDMS@rGO@PU sensor.
Fourier transform infrared spectroscopy (FT-IR): used to characterize the chemical structure and bonding force between rGO and PU.
Scanning electron microscopy (SEM): showed the uniform distribution of CNTs and MXene in the composite material, ensuring the excellent conductivity of the electrode.
Mechanical properties tested by universal testing machine: The typical stress-strain curve of the sensor was tested at a loading rate of 10 mm/min under a 30% strain load, indicating that the sensor exhibited small nonlinear mechanical properties at 30% strain.
Preparation of nanofiber electrodes:
Electrospinning technology can be used to prepare nanofiber electrodes, which can be used as conductive layers in pressure sensors. Through electrospinning, nanofibers with specific diameters and surface properties can be manufactured to optimize the electrical properties and mechanical stability of the sensor.
Reinforcement of composites:
Electrospinning can be used to prepare reinforced nanofiber composites that can be combined with PDMS to enhance the structural integrity and conductive properties of the sensor.
Surface modification:
By electrospinning, specific functional groups or nanostructures can be introduced on the surface of nanofibers. These modifications can improve the sensitivity and selectivity of the sensor.
The designed copper-doped flexible silicate nanofibers have good physicochemical properties and biocompatibility, can induce angiogenesis and polarization of macrophages toward an anti-inflammatory phenotype, and have antibacterial properties. The results have the potential to replace eye patch dressings, promote conjunctival regeneration, and have a positive impact on other ophthalmic wounds.
Electrospinning Nanofibers Article Source:
